Michael, Eastern Europe (i.e., Poland, Czhechoslovakia, Romania, Bolgaria, Hungary, East Germany) was never "part of Russia." These countries were part of the Warsaw Block, their governments were puppets of Moscow, but still they had their own statehood, so Russia could not and did not "give them back" (back--to whom?). When Communism died in the former Soviet Union, then Communist governments in the eastern block countries could not hold on to power anymore and they gave in to the pressure of their own so called "velvet revolutions". These were not the fifteen republics of the Sov. Union (many of which found statehood they hadn't been struggling for); these were sovereign states _under_ Soviet influence.
ISIS kills 22 in Yemen's Sanaa, Aden; targets both gov't and Houthi rebels (Reuters)
from the article: Mayor defends plan to raze Palestinian homes in East Jerusalem